arm_tpiu_swo: fix support for deprecated 'tpiu' command before 'init'

arm_tpiu_swo: fix support for deprecated 'tpiu' command before 'init'

Commit dc7b32ea4a00 ("armv7m_trace: get rid of the old tpiu code")
is not handling correctly the old 'tpiu' command if it is run
during the config phase (before command 'init').

Move the call to the old event handler 'trace-config' in function
jim_arm_tpiu_swo_enable(), so it is correctly executed after
'init'.

Add the call to the old event handler 'trace-config' also during
jim_arm_tpiu_swo_disable(), to match the old behaviour.

Add more information while alerting that the event 'trace-config'
is deprecated.

Change-Id: If831d9159b4634c74e19c04099d041a6e2be3f2a
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: dc7b32ea4a00 ("armv7m_trace: get rid of the old tpiu code")
Reviewed-on: https://review.openocd.org/c/openocd/+/6561
Tested-by: jenkins
Reviewed-by: Karl Palsson <karlp@tweak.net.au>